Center-indicating device.



, J. G. ANTHONY. CENTER INDIOATING DEVICE. APPLIOATIQN nLiED MAB..27. 1913.

PatentedApr. s, 1913.

JOEEPH G. ANTHONY, F DETROIT, MICHIGAN,

CENTERJNDICATING DEVICE.

Appiication filed March 27,

Specification of Letters Patent.

Patented Apr. 8, 1913.

1512. Serial No. 686,604.

Tr; all whom 1 m (13/ mince/"n Be it. known that l, Josnru (it, Ax'ruony, a citizcn of the United SifilL P, residing at Detroit, in thc county of lVavnc and State of Michigan, have invcntci new and useful improienicms in t nc!indicating De- V IC j which tin ionmvin is a specificaiitifi,

Tho invention ro to indicating de vices, and more part hul to the class of ccntcr iinlicutingr tlcvicee that use in lnthes, miiiing or other :nachinci'v.

The primary ohicri the provision Price of this chnractciin which mo -iuurl; of lathe hor in or millii owl-imum) hr accurately cenwrmi Pe ition to ihc w rk to he opcrateil upon,

tilt invention is 1 ins:

Axioth i' o iert t iw iilV-Jlllltfll la: the proin of r: {it oi tin harvictm' which is dom nion to ho "w-il in adjusting: and lti i zstini; rut "xiiv no point or hole in :1 piece 1 o't' work in lfi tiiil upon in a lathe chuck or i on a ta o 3: :14; ct any oihox machine, and wil ruzilrh tin: testing; of the truth I or a shaft between the ilt' im' ii,

hat of tire invention is the t n mzinr indicating (lcvice of "ii -ii is simple in construct sniff hiwivn: in pcratiomeasily h Hi' li ililm} in action and also 4 munntacinrwi at a, minin'ium venturing Similar reference characters indicate corresponding parts throughout the several views in the drawing.

Referring to the drawing by numerals, 5 designates generally a chuck of a lathe, mill ing, drilling, or any other machinery, and is of the ordinary well-known construction, and i3 is the work support therefor, in which the nirco of work to be mounted for oper on upon by tho machine. Prior to the tilting of a tool within the chuck 5 to be cngz igcd with the piece of Work, is placed therein a center indicating device presently 'l'tfiCt'll'i ftl.

Thc indicating device comprises a circular shank 7 provided with a center bore 8 extending illlOllgllOtlt a greater portion of the lcngth of the same and opening through one end thereof. The shank 7 is formed with reduced end 9, through which the said hore 8 opens, and is provided with slits l0 thrilling: a resilient socket in which is engaged the spherical portion 11 of a centerin; pin 12 having its inner end portion 13 extended within the bore 8 for oscillatory movement therein while its outer end 14 is formed with a tapered point 15 adapted to engage in a ccnter indication or mark in or on the piece of work to be operated upon v the nmchine for indicating the axis of tho truev center of the Work in a manner prcscntly described.

Fornictl transversely in the shank 7 and ii'itm'sccring the bore 8 there is near its rear cnd i-.- a guide opt-hing it; in which is mount- Oil :2 laterally (lisplaceahlc tooth rack bar 17 owning; with a gear pinion 18 fixed to the vci' ical axle portion iii of an indicator hand :26 waver-sable over it graduated dial 21 nn'mntciil uithin a t'nl'w-slnipetl block 22 detn i-hahiy final on the shank T, the nlock '22 4 't'ornictl with threaded apertures 23 wring with tho trausvcrsc opening 16 to town a gg'uidc way ihervin for the said i'iu-la lmr 1?, "lho axle portion 19 of the in iiicator hand it) is jonrnaled in the shank 7 0 that the latter may frecly rotate over the dial ii. on the turning of the gear pinion l8 \vlnni the rack hm l? l: latcrally shifted. Th rack liar is fornictl with :1 notch 24 in ts tot-ward ctlgc which loosclv engages tho tcrniinal f thc nncr cud portion 13 0t tin ct-ntcring pin 12, whcrchy on thc lateral "Nation of the centering pin the rack bar Y or screws 31,

will be simultaneously moved therewith so that the indicator hand 20 will traverse the dial 2] to enable the accurate reading of the degree of angular disposition of the indicator pin. Thus, it will be seen that the centering nin may be adjusted to accurately ascertain the true center ofthe piece of work to be operated upon by the machine, and thereafter the indicating device can be de tached from the chuck, it being understood of course that the support for the latter is locked in its true adjusted position prior to the removal of the indicating device, so that when the tool is inserted in the chuck it will be sustained in true central adjustment with relation to the piece of work.

To protect the indicator hand :20 and the dial 21 and also to make the same visible there is provided a peep opening 26 in the block 22 and this opening is covered by a transparent disk 27.

Loosely surrounding the closed end of the shank 7 is a sleeve 28 formed at its inner end with an abutment flange 29 the sleeve being designed to tit into the chuck 5 and is closed at its outer end to term a bearing for a compression spring 30 arranged x 'ithin the said sleeve and engaging the closed end of the shank 7 so as to permit slight longitudinal movement of the shank in the sleeve thereby avoiding the blunting of the point 15 of the indi 'ator pin 1; when being moved into engagement with a piece of work. Threaded in diametrically opposite points of the flange 29 on the sleeve 28 are guide pins the inner ends of which loosely engage in elongated guide grooves 32 formed in the shank 7 so that in this manner the said shank is prevented from rotation in the sleeve 28 when the latter is mounted in the chuck but will be free tomove longitudinally against the resistance of the compres sion spring 30 when setting the indicator device with respect to the piece of work.

Engaged in the threaded apertures 93 in the block are adjustable plugs 33 which limit the lateral shifting of the rack bar 17 in said block.

Formed on the reduced end exteriorly thereof are screw threads 34 with which engages a locking collar 35 to retain the spherical portion 11 of the pin 12 in the said reduced end 9 of the shank and thereby avoids the accidental detachment of the cen teringpin from the shank of the device while in use.

From the foregoing description, taken in connection with the accompanying drawing, it is thought that the construction and operation of the invention will be clearly unblock carried by the shank and having a graduated dial therein, an indicating pointer adapted to rotate over the dial, and having an axle journaled in the shank, a gear wheel fixed to said axle and concealed within the shank. and a rack bar meshing with said gear wheel and loosely engaged by the end of the centering pin.

An indicator device comprising a shank.,having a bore opening through one end and also a transverse opening between its ends intersecting said bore, a centering pin swiveled in the open end of the shank, a block carried by the shank and having a graduated dial therein, an indicating pointer adapted to rotate over the dial, and having an axle journaled in the shank, a gear wheel fixed to said axle and concealed within the shank, a rack bar meshing with said gear wheel and loosely engaged by the end of the centering pin, a sleeve closed end of the shank, sleeve to the shank to permit slight longitudinal displadement of the latter and spring compression means arranged within pins connecting the the sleeve and working against the closed 100 end of the shank for tensioning it on the 10m gitudinal displacement there f.

In testimony (whereof 1 affix my signature in presence of two witnesses.

JOSEPH G. ANTHONY. \Vitnesses James C. FERGUSON,

EDWARD A THONY means of expan- 65 comprising a 70 surrounding the 

